JP4305753B2 - Waterproof case - Google Patents

Description

  The present invention relates to a waterproof case that protects articles stored in the case from intrusion of water or the like.

  Conventionally, in a control unit that performs steering force control of an electric power steering device, fuel injection control of an engine, or ignition control in an automobile, for example, electronic components mounted on a circuit board are protected from an external environment such as rainwater. In order to do so, the circuit board is housed in the housing case.

  For example, a control unit has been proposed in which a circuit board is housed in a housing case, a lid is attached to the opening of the housing case, and the four corners are fixed to the housing case with screws ( Patent Document 1).

  There has also been proposed a control unit that integrally connects the housing case and the lid without using a mounting screw (see Patent Documents 2 and 3).

JP-A-8-177518 Japanese Patent No. 2980591 JP 2000-77869 A

  In the control unit of Patent Document 1, since the housing case and the lid are attached with screws, a tool such as a screwdriver is required when the lid is attached and detached, and the four screws must be operated one by one. In other words, there are problems that the number of assembling steps is increased and it takes time to replace the circuit board.

  In the control units of Patent Documents 2 and 3, as shown in FIG. 13, the housing case 66 and the lid body 65 are not screwed, but the housing case 66 is provided with fitting holes 67a and 67b. The cover 69 is provided with fitting projections 68a and 68b, and the fitting projections 68a and 68b are fitted into the fitting holes 67a and 67b, whereby the housing case 66 and the lid 65 are fixed. Therefore, the attachment and detachment of the lid 65 is relatively easy, but since the waterproof property at the joint portion of the housing case 66 and the lid 65 is not considered, moisture may enter the control unit. There were restrictions on the installation of the control unit, such as being unable to install it in places where water droplets scatter.

  In the control unit of Patent Document 1, an O-ring is inserted between the casing case and the lid to consider waterproofness. However, in the waterproof structure of such a control unit, an O-ring is provided on the end surface of the opening of the casing case. A storage groove must be formed, the structure of the housing case becomes complicated, and manufacturing costs are high. In addition, the housing is fixed with screws, so many screws are used to bathe the seal. Therefore, it takes time to disassemble and assemble, and there is also a problem that the sealing performance is impaired when the tightening condition of the screw becomes unbalanced.

  As described above, none of the conventional control units can sufficiently satisfy both the detachability of the lid and the waterproofness against water.

Means for Solving the Problems and Effects of the Invention

  The subject of this invention is providing the waterproof case which has the waterproofness which improved workability | operativity and reliability, without causing the cost increase.

The present invention is to provide a waterproof case for solving the above problems. That is,
In a waterproof case including a case body having a storage space and a resin case lid covering an opening of the case body,
A case in which an O-ring for sealing is sandwiched between the case main body and the case lid, and an engagement element is provided between the case main body and the case lid to be fitted together and integrally mounted, and the engagement elements are fitted together It is assumed that the O-ring is compressed in the fitting direction by the elastic force of the engagement element that is integrated with the case body or the case lid in a state where the main body and the case lid are integrally mounted so that the waterproof function is achieved by the O-ring. And

More specifically, the case lid in the waterproof case of the present invention includes a bent portion positioned in a plane perpendicular to the fitting direction, and is configured so that the shape of the bent portion can be changed from a flat state to a bent state. ,
The engaging element includes a positioning engaging element that guides and regulates a mounting position of the case lid with respect to the case body, and a locking engaging element that maintains the mounting state of the case cover with respect to the case body.
The positioning engagement element is constituted by a locking hole on the case body and a locking projection that fits into the locking hole, and the locking engagement element is formed on the locking hole on the case body and its locking It is composed of a locking projection that fits into the hole .

  Specifically, the locking convex portion is divided into two parts so that the shape can be changed from the planar state to the bent state across the bent portion.

  The case lid can be folded by a groove formed in the bent portion and the remaining thin wall.

  With the above configuration, the lid can be assembled to the main body without using a screw. In addition, since the bent portion has the locking convex portion, the case lid can be securely attached to the case body, and rattling of the case lid can be prevented.

  In the waterproof case of the present invention, a screw for fixing the case lid to the case body is not necessary. Therefore, the number of parts can be reduced and the cost can be reduced. Further, since the screw tightening process is not required when the case main body and the case lid are fixed, the work man-hours and assembly time can be reduced. Furthermore, since no adhesive is used, there is no adhesive application step requiring accuracy of the application amount and application position, and the number of work steps and assembly time can be reduced.

  When the case main body and the case lid are integrally mounted, the O-ring is compressed in the fitting direction by the elastic force of the engagement element that is integral with the case main body or the case lid, thereby realizing a waterproof case that plays a waterproof role.

  Hereinafter, a first embodiment of a waterproof case according to the present invention will be described with reference to the drawings. In this embodiment, the waterproof case of the present invention is applied to an electronic control unit, but the scope of application is not limited to an electronic control unit, but can be applied to a battery case or the like. is there. 1 is an exploded perspective view of the waterproof case 1, FIG. 2 is a view of the assembled state of the waterproof case 1 from above, and FIG. 3 is an inside view of the waterproof case 1 from the opening 15 with the case lid 7 of FIG. It is the front view which omitted a part which looked at the direction.

  In these drawings, the waterproof case 1 includes a box-shaped case body 2 made of synthetic resin or metal and having an opening 15 on the front surface, and a case lid 7 that closes the opening 15 of the case body 2. The case body 2 includes locking holes 3 a and 3 b provided at the upper and lower edges of the opening 15 and locking holes 4 a and 4 b provided at the left and right edges of the opening 15.

  Locking convex portions 8 a and 8 b for engaging with the locking holes 4 a and 4 b of the case body 2 are provided on the left and right in the longitudinal direction of the case lid 7. Further, on the upper and lower sides of the case lid 7, locking convex portions 9 a and 9 b for engaging with the locking holes 3 a and 3 b of the case body 2 are provided. The locking convex portions 8 a and 8 b and the locking convex portions 9 a and 9 b are formed integrally with the case lid 7. Further, a connector 10 is formed integrally with the case lid 7. Reference numeral 12 denotes an inner lid that is joined to the case lid 7 or formed integrally with the case lid 7 and is fitted into the inner wall portion 17 of the case body 2.

  Reference numeral 16 denotes a thick portion formed rearward from the rear edge portion of the locking holes 3a, 3b, 4a, 4b on the inner walls of both side walls, and the front edge portion serves as a stopper for the case lid 7 described later. 5a and 5b are guide grooves of the printed circuit board which are provided on both side walls of the case main body 2 and open to the opening 15 side, and the upper and lower widths thereof are formed slightly wider than the thickness of the printed circuit board 6 described later.

  The locking holes 4a and 4b and the locking projections 8a and 8b correspond to the positioning engagement elements of the engagement elements of the present invention, and the locking holes 3a and 3b and the locking projections 9a. , 9b correspond to the locking engagement element among the engagement elements of the present invention.

  Reference numeral 6 denotes a printed circuit board on which electronic components and the like forming a control circuit are mounted (electronic components and the like are omitted). The printed circuit board 6 protrudes outward from the case cover 7 via the lead wires 11 and the case cover. 7 is connected to a connector 10 formed integrally with the connector 7.

  FIG. 4 is an enlarged view of the locking convex portion 9a as viewed from above the case lid 7. As shown in FIG. As shown in FIG. 4A, a groove 14 is formed in the locking convex portion 9a so that the case lid 7 can be bent toward the inner lid 12, and the depth of the groove is deeper than the thickness of the case lid 7. The depth is such that the case lid 7 and the locking projection 9a are not separated. When the case lid 7 is not in a folded state, the cross section viewed from above the locking protrusion 9a is a shape in which a part of the two locking protrusions 9a are in contact, that is, as shown in FIG. When the case lid 7 is not in a bent state, the groove portion 14 has a shape that forms a substantially isosceles triangle. A groove 18 is also formed in the inner lid 12 on the opposite side of the groove 14 of the case lid 7 and is divided at the groove 14. As shown in FIG. 4B, the groove 18 is substantially V-shaped so that the case lid 7 can be bent toward the inner lid 12. The groove portion 14 and the groove portion 18 correspond to a bent portion of the present invention.

  The groove portion 14 and the groove portion 18 forming the bent portion are formed only on the case lid 7, and the locking convex portion 9 a is separated on the extension line (bending line) of the groove portion 14 and the groove portion 18. Good. Further, the connector 10 is not arranged on the fold line of the groove 14 and the groove 18.

  The lead wire 11 is set to a sufficient length so as to ensure a sufficient gap between the printed circuit board 6 and the case lid 7. Thereby, when the case lid 7 is bent toward the inner lid 12, the inner lid 12 does not come into contact with the printed circuit board 6, and further, the case lid 7 does not come into contact with the case main body 2.

  An O-ring 13 is attached along the outer periphery of the inner lid 12. The O-ring 13 can use rubber, organic resin, or the like, and the material is not particularly limited. As shown in FIG. 3, the O-ring 13 is attached to the stopper 16 by the pressing force when the case lid 7 is locked to the case body 2 so as to follow the opening 15 of the case body 2 in the assembled state of the case lid 7. Pressed.

  Next, an example of the assembly procedure of the waterproof case 1 configured as described above will be described. It is assumed that electronic components are mounted on the printed circuit board 6 in advance. First, as shown in FIG. 2A, the case lid 7 is bent at a predetermined angle, and the printed circuit board 6 is inserted from the opening 5 of the case body 2 using the guide grooves 5a and 5b as guides. At this time, in order to first insert the locking convex portion 8b into the locking hole 4b, the printed circuit board 6 is tilted counterclockwise about O and the left front corner with respect to the insertion direction of the printed circuit board 6 is used. The part passes through the guide groove 5a and is inserted so that a part of the right peripheral edge part passes through the guide groove 5b with respect to the insertion direction of the printed circuit board 6.

  When the locking convex portion 8b is inserted into the locking hole 4b, the bending angle of the case lid 7 or the insertion angle of the printed circuit board 6 is adjusted, and the locking convex portion 8a is inserted into the locking hole 4a. In this state, the locking convex portion 8b and the locking hole 4b, and the locking convex portion 8a and the locking hole 4a are in a state in which positioning for mounting the case lid 7 on the case body 2 is performed. It is not securely locked. Next, when the case lid 7 is pushed toward the back of the case body 2 while reducing the bending angle, the locking projections 9a and 9b are locked to the locking holes 3a and 3b, and together with the locking projections. The case lid 7 is assembled to the case main body 2 by reliably locking the locking projections 8a and the locking holes 4a. FIG. 5A shows a state after assembly.

  In FIG. 5A, since the printed circuit board 6 is inserted into the case body 2 in an inclined state, the inner width of the case body 2 (that is, the distance between the side walls 17a and 17b) is the width of the printed circuit board 6. Is slightly wider than. Therefore, as shown in FIG. 5A, the printed board 6 is not held by the guide groove 5a, but the board holding portions 19a and 19b at the innermost part of the guide grooves 5a and 5b hold the printed board 6. Therefore, it is possible to prevent rattling of the printed circuit board 6 after assembly.

  If the printed circuit board 6 is erroneously inserted upside down, the guide grooves 5a and 5b are not arranged at the center of the side walls 17a and 17b, and the locking holes 3a and 3b and the lock Since the convex portions 9a and 9b are not arranged at the center portions of the case main body 2 and the case lid 7, erroneous insertion can be easily prevented.

  Even if the guide grooves 5a and 5b and the printed circuit board 6 are aligned when the printed circuit board 6 is erroneously inserted, the locking holes 3a and 3b and the locking projections 9a and 9b are not matched, so that In addition, since the case main body 2 and the case lid 7 cannot be fitted, the erroneous insertion state can be easily determined by a simple appearance check.

  FIG. 5B shows an enlarged view of the state in which the locking projection 8a is locked in the locking hole 4a. The left side surface portion of the inner lid 12 is in contact with the inner wall portion 17a. An O-ring 13 is provided between the stopper 16 of the case body 2 and the case lid 7, and is in contact with the stopper 16, the case lid 7, and the inner lid 12 by the pressing force of the case lid 7. When the case lid 7 is attached, the gap L between the case lid 7 and the stopper 16 is set to be smaller than the diameter of the free state of the O-ring 13, and the O-ring 13 is compressed and deformed by the attachment of the case lid 7. 7, the outer peripheral surface of the inner lid 12, and the end surface of the stopper 16 are brought into close contact with an appropriate pressure, so that a reliable sealing function can be expected. Thereby, even if a liquid such as water enters from between the case main body 2 and the case lid 7, the O-ring 13 can surely prevent the liquid from entering the case. In addition, in FIG.5 (b), you may take the form in which the O-ring 13 contact | connects also the inner peripheral part of the case main body 2. FIG.

  Hereinafter, a second embodiment of the waterproof case of the present invention will be described with reference to the drawings. The waterproof case 100 according to the second embodiment is a modification of the method of locking the case body 2 and the case lid 7 according to the first embodiment of the present invention. Therefore, since the parts not involved in the locking are the same as the configuration of the waterproof case 1 according to the first embodiment of the present invention, in the description of the waterproof case 1 according to the first embodiment of the present invention. The description will be made using reference numerals attached to the respective components. Moreover, the description is abbreviate | omitted about the thing same as the structure of the waterproof case 1 concerning 1st Embodiment. FIG. 6 is a view of the assembled state of the waterproof case 100 as seen from above, and FIG. 7 is a front view of the interior of the waterproof case 100 viewed from the opening 15 with the case lid 7 removed, with a part omitted. .

  FIG. 6 shows the waterproof case 100 as viewed from above. The waterproof case 100 includes a box-shaped case body 2 made of synthetic resin or metal and having an opening 15 on the front surface, and a case lid 7 that closes the opening 15 of the case body 2. Reference numeral 31 denotes a locking hole provided in the left side edge of the stopper 16, and 32 denotes a locking hole provided in the right side edge of the opening 15.

  The case lid 7 is made of synthetic resin and closes the opening 15 of the case body 2. A locking claw 33 for engaging with the locking hole 31 of the case body 2 is provided at the left end in the longitudinal direction. The front end is provided so as to protrude in the insertion direction of the case body 2, and a locking projection 34 for engaging with the locking hole 32 of the case body 2 is provided at the left end in the longitudinal direction. The locking claw 33 and the locking projection 34 are formed integrally with the case lid 7. The locking claw 33 is substantially L-shaped and can be elastically deformed in the direction A, and an inclined surface 33a is formed at the tip of the locking claw 33 so as to engage the locking hole 31 smoothly and reliably. It has become.

  The locking hole 32 and the locking convex portion 34 correspond to the positioning engaging element of the engaging elements of the present invention, and the locking hole 31 and the locking claw portion 33 are related to the present invention. It corresponds to the locking engagement element among the combined elements.

  A connector 10 is integrally formed on the case lid 7. Reference numeral 12 denotes an inner lid that is joined to the case lid 7 or formed integrally with the case lid 7 and is fitted into the inner wall portion 17 of the case body 2.

  Next, an example of an assembly procedure of the waterproof case 100 configured as described above will be described. It is assumed that electronic components are mounted on the printed circuit board 6 in advance. First, as shown in FIG. 6A, the printed circuit board 6 is inserted from the opening 5 of the case body 2 with the case lid 7 as a guide using the guide grooves 5a and 5b. At this time, in order to first insert the locking projection 34 into the locking hole 32, the printed circuit board 6 is tilted counterclockwise about O, and the left front corner with respect to the insertion direction of the printed circuit board 6. The part passes through the guide groove 5a and is inserted so that a part of the right peripheral edge part passes through the guide groove 5b with respect to the insertion direction of the printed circuit board 6.

  When the locking projection 34 is inserted into the locking hole 32, the locking claw 33 is inserted into the locking hole 31 by adjusting (subtracting) the insertion angle of the printed circuit board 6. At this time, even if the locking projection 34 is displaced with respect to the locking hole 32, it is smoothly inserted into the locking hole 31 by being guided by the inclined surface 33 a and elastically deforming. Finally, the locking projection 34 and the locking hole 32, and the locking claw 33 and the locking hole 31 are securely locked, and the case lid 7 is assembled to the case body 2. FIG. 8A shows a state after assembly.

  Since the printed board 6 is inserted into the case main body 2 in an inclined state, the inner width of the case main body 2 (that is, the distance between the side walls 17a and 17b) is slightly wider than the width of the printed board 6. . Therefore, as shown in FIG. 8A, the printed board 6 is not held by the guide groove 5a, but the board holding parts 19a, 19b at the innermost part of the guide grooves 5a, 5b hold the printed board 6. Therefore, it is possible to prevent rattling of the printed circuit board 6 after assembly.

  FIG. 8B shows an enlarged view of the state in which the locking claw 33 is locked in the locking hole 31. The left side surface portion of the inner lid 12 is in contact with the inner wall portion 17a. An O-ring 13 is provided between the stopper 16 of the case body 2 and the case lid 7, and is in contact with the stopper 16, the case lid 7, and the inner lid 12 by the pressing force of the case lid 7. When the case lid 7 is attached, the gap L between the case lid 7 and the stopper 16 is set to be smaller than the diameter of the free state of the O-ring 13, and the O-ring 13 is compressed and deformed by the attachment of the case lid 7. 7, the outer peripheral surface of the inner lid 12, and the end surface of the stopper 16 are brought into close contact with an appropriate pressure, so that a reliable sealing function can be expected. Thereby, even if a liquid such as water enters from between the case main body 2 and the case lid 7, the O-ring 13 can surely prevent the liquid from entering the case. In addition, in FIG.8 (b), you may take the form in which the O-ring 13 contact | connects also the inner peripheral part of the case main body 2. FIG.

  Hereinafter, a third embodiment of the waterproof case of the present invention will be described with reference to the drawings. The waterproof case 200 according to the third embodiment is a modification of the method for locking the case body 2 and the case lid 7 according to the first embodiment of the present invention. Therefore, since the parts not involved in the locking are the same as the configuration of the waterproof case 1 according to the first embodiment of the present invention, in the description of the waterproof case 1 according to the first embodiment of the present invention. The description will be made using reference numerals attached to the respective components. FIG. 9 is a view of the assembled state of the waterproof case 200 as viewed from above, and FIG. 10 is a front view of the interior of the waterproof case 200 viewed from the opening 15 with the case lid removed, with a part omitted.

  FIG. 9 shows the waterproof case 200 as viewed from above. The waterproof case 200 includes a box-shaped case body 2 made of synthetic resin or metal and having an opening 15 on the front surface, and a case lid 7 that closes the opening 15 of the case body 2. Reference numerals 41 and 42 denote locking holes provided at the edge of the opening 15. In addition, there are also locking holes 43 and 44 in the lower edge of the opening 15 (see FIG. 10).

  Locking convex portions 51 and 52 for engaging with the locking holes 41 and 42 of the case body 2 are provided on the upper portion of the case lid 7. The locking convex portions 51 and 52 are formed integrally with the case lid 7 so as to protrude above the case lid 7. Further, locking protrusions 53 and 54 for engaging with the locking holes 43 and 44 of the case body 2 are provided at the lower part of the case lid 7. The locking convex portions 53 and 54 are formed integrally with the case lid 7 so as to protrude below the case lid 7. The locking convex portion is substantially L-shaped and can be elastically deformed in the insertion direction of the case lid 7, and inclined surfaces 51a, 52a, 53a, 54a are formed on the inner lid 12 side of the tip. The engaging holes 41, 42, 43 and 44 are engaged smoothly and reliably.

  The locking holes 41, 42, 43, 44 and the locking projections 51, 52, 53, 54 correspond to the engagement elements of the present invention.

  Next, an example of an assembly procedure of the waterproof case 200 configured as described above will be described. It is assumed that electronic components are mounted on the printed circuit board 6 in advance. First, as shown in FIG. 9A, the printed circuit board 6 is inserted from the opening 5 of the case body 2 with the case lid 7 as a guide using the guide grooves 5a and 5b.

  The locking convex portions 51, 52, 53, 54 are elastically deformed in the direction opposite to the insertion direction of the case lid 7 when coming into contact with the outer edge portion of the case body 2. The inclined surfaces 51a, 52a, 53a, 54a move along the inner wall of the opening 5 of the case body 2, and are inserted into the locking holes 41, 42, 43, 44, respectively, and the locking convex portions 51, 52, When 53 and 54 return to the original form, they are engaged.

  When the locking projections 51, 52, 53, 54 are engaged with the locking holes 41, 42, 43, 44, respectively, the case lid 7 is assembled to the case body 2. FIG. 11A shows a state after assembly. Since the printed circuit board 6 is held in the guide grooves 5a and 5b, rattling of the printed circuit board 6 can be prevented.

  FIG. 11B shows an enlarged view of the case lid 7 as viewed from above in a state where the case lid 7 is assembled to the case main body 2. The left side surface portion of the inner lid 12 is in contact with the inner wall portion 17a. An O-ring 13 is provided between the stopper 16 of the case body 2 and the case lid 7, and is in contact with the stopper 16, the case lid 7, and the inner lid 12 by the pressing force of the case lid 7.

  As shown in FIGS. 11B and 12 (details will be described later), the gap L between the case lid 7 and the stopper 16 is set smaller than the free diameter of the O-ring 13 when the case lid 7 is attached. Since the O-ring 13 is compressed and deformed by the attachment of the case lid 7, the O-ring 13 is brought into close contact with the back surface of the case lid 7, the outer peripheral surface of the inner lid 12, and the end surface of the stopper 16 with an appropriate pressure. Thereby, even if a liquid such as water enters from between the case main body 2 and the case lid 7, the O-ring 13 can surely prevent the liquid from entering the case. In addition, in FIG.11 (b), you may take the form in which the O-ring 13 contact | connects also the inner peripheral part of the case main body 2. FIG.

  FIG. 12 is a cross-sectional view seen from the right side in the insertion direction of the printed circuit board 6 with the case lid 7 assembled to the case body 2. In FIG. 12A, the locking convex portions 52 and 54 are engaged with the locking holes 42 and 44, respectively, and the case lid 7 presses the O-ring 13 against the stopper 16 by the pressing force thereby. FIG. 12B is an enlarged view of the locking convex portion 52, the locking hole 42 and its peripheral portion. The case lid 7 is pushed in the B direction by the contact pressure of the O-ring 13, but the locking projection 52 is also pushed in the B direction and elastically deformed to the surface Y on the side close to the opening of the locking hole 42. It adheres without doing. At this time, the surface Y serves as a stopper. The same applies to the other locking projections (51, 53, 54) and the locking holes (41, 43, 44), and the surface close to the opening of each locking hole is the surface of each locking projection. It becomes a stopper. Therefore, the case lid 7 is securely assembled to the case body 2.

  Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these embodiments, and the knowledge of those skilled in the art can be used without departing from the spirit of the claims. Various modifications based on this are possible.

It is the perspective view which showed the structure of the waterproof case. Example 1 It is explanatory drawing which showed the assembly method of the waterproof case. Example 1 It is explanatory drawing which showed the structure of the front of a case part. Example 1 It is explanatory drawing which showed the detail of the bending part. Example 1 It is explanatory drawing which showed the state of the waterproof case after an assembly | attachment. Example 1 It is explanatory drawing which showed the assembly method of the waterproof case. (Example 2) It is explanatory drawing which showed the structure of the front of a case part. (Example 2) It is explanatory drawing which showed the state of the waterproof case after an assembly | attachment. (Example 2) It is explanatory drawing which showed the assembly method of the waterproof case. (Example 3) It is explanatory drawing which showed the structure of the front of a case part. (Example 3) It is explanatory drawing which showed the state of the waterproof case after an assembly | attachment. (Example 3) It is explanatory drawing which showed the state of the waterproof case after an assembly | attachment from the side. (Example 3) It is explanatory drawing which showed the structure of the case of the prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waterproof case 2 Case main body 3a, 3b Locking hole 4a, 4b Locking hole 7 Case lid 8a, 8b Locking convex part 9a, 9b Locking convex part 10 Connector 12 Inner lid 13 O-ring 14 Groove part 15 Opening part 16 Stopper 17a, 17b Side wall part 18 Groove part 31, 32 Locking hole 33, 34 Locking convex part 41, 42, 43, 44 Locking hole 51, 52, 53, 54 Locking convex part 100 Waterproof case 200 Waterproof case

Claims (1)

In a waterproof case including a case body having a storage space and a resin case lid covering an opening of the case body,
An O-ring for sealing is sandwiched between the case main body and the case lid, and an engagement element is provided between the case main body and the case lid so as to be fitted and integrated with each other. In the state where the case body and the case lid are fitted together, the O-ring is compressed in the fitting direction by the elastic force of the engagement element that is integral with the case body or the case lid. a waterproof case, characterized in that it has to serve the waterproofing function by,
The case lid includes a bent portion positioned in a plane perpendicular to the fitting direction, and is configured so that the shape can be changed from a flat state to a bent state at the bent portion.
A positioning engagement element that guides and restricts the mounting position of the case lid with respect to the case body, and a locking engagement that is included in the bent portion and maintains the mounting state of the case lid with respect to the case body Composed of elements and
The positioning engagement element is configured by a locking hole on the case body and a locking convex portion that fits into the locking hole, and the locking engagement element is formed on a locking hole on the case body. , Constituted by a locking projection that fits into the locking hole,
The locking convex portion is divided into two parts so that the shape can be changed from a planar state to a bent state across the bent portion,
The waterproof case , wherein the case lid can be bent by a groove formed in the bent portion and a remaining thin wall .

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